01. The system is set up, but there is no sound output.

• There may be no power. Please check whether the power indicators on the V3 and power adapter are on or not.
• The volume may be too low. Please turn the volume knob clockwise to raise the volume.
• The audio cables may be connected incorrectly. Please follow the instructions above to reconnect the cables;
• The songs in your audio source device may not be played or the sound is muted. Please check on the audio source device.

02. The sound output is abnormal.

• Please ensure the polarity is matched correctly when you connect the speaker cables to the binding posts. The red is the positive pole, while black is the negative pole;
• The speaker cables may not be in good contact. Please try to reconnect or swap the cables;
• The RCA cable may not be in good contact. Please try to reconnect or swap it;
• The V3 amplifier may be overloaded. Please turn down the volume.

03. Cannot play when connecting the turntable.

• The turntable may not have a built-in phono preamplifier. Please check in your turntable's user manual. You'll need an external preamplifier to connect your turntable and the V3 to play your record;
• The phono output mode may be incorrect. Generally speaking, there are phono output and line output modes. Please select the line output.

04. Why the device connected to the pre-out is still playing after turning V3 off?

• The pre-out terminal is designed to bypass the amplifier's built-in power amplification stage. The knob on V3 does not affect the pre-out's signal output or volume. You need to turn off or modify the volume on the device connected to the pre-out.

NOTE: If you still can't solve the problems, please scan the QR code to learn more or contact our support team support@fosiaudio.com